US President Joe Biden signed a law on Thursday to block Chinese telecommunications companies like Huawei and ZTE from obtaining new equipment licences from US regulators, the latest move from Washington to crack down on China’s tech giants over national security concerns. The new law, called the Secure Equipment Act, prevents the US Federal Communications Commission (FCC) from granting or reviewing applications for licences from companies that the agency determines are a security threat to the US. Brendan Carr, the FCC’s senior Republican commissioner, said last month that the bill would “close a glaring loophole that Huawei and others are...